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Eosinophil count (serum/plasma concentration)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of eosinophils, a type of white blood cell, in your blood. Eosinophils help fight infections and respond to allergies and inflammation.

Quick summary

["Eosinophils help your body defend against parasites and allergens, but elevated levels may signal conditions like allergies or certain infections."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
93495-0
Short code
EDDP Ur Ql Scn
Synonyms
EDDP Ur Ql Scn
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
screen
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your doctor may order this test to investigate symptoms such as persistent itching, skin rashes, asthma, or chronic sinusitis. It can also help diagnose conditions like allergic reactions, parasitic infections, or certain blood disorders.

What to Expect Before the Test

No special preparation is needed. A blood sample is typically drawn from a vein in your arm. If you’re on blood-thinning medication, let your doctor know before the test.

How the Test Works

Blood is collected and analyzed to count eosinophils, a type of white blood cell. The result is expressed as a concentration in the bloodstream, though exact reference ranges vary by lab.

Possible Results and Their Meanings

Elevated eosinophil levels may indicate allergies, asthma, parasitic infections, or inflammatory conditions. Lower-than-normal levels might suggest immune suppression or certain autoimmune disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: When to Follow Up

Short name

Eosinophil Level

Frequently asked questions

If your test results show unusually high or low eosinophil counts, your doctor may recommend further testing or treatments to address the underlying cause.
Elevated eosinophils could mean you have an allergy, infection, or another condition that triggers their release. Follow-up may include allergy testing, parasite screening, or monitoring symptoms.
If your eosinophil count is low, it might suggest a weakened immune response or conditions like HIV/AIDS, chemotherapy side effects, or certain autoimmune diseases. Your doctor may check other blood counts or symptoms.
Do I need to avoid certain foods or medications before this test?
No special diet or medications are required. However, inform your doctor if you’re on blood-thinning drugs or have recent infections, as these can affect blood cell counts.
Most eosinophil tests require a lab sample, so they’re typically done in a clinical setting. Some at-home blood tests can measure white blood cell counts, but they may not provide detailed eosinophil analysis.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy